Speaking from personal experience, with the jobs I've personally had, if you can't tell someone else what you do for work in a single sentence, you don't have a real job
@MLE_online the last time i had a real job they let me go on day two 
@MLE_online Hopefully it's OK if it's a long sentence, cuz I do five or six things for my day job.
@aktbar i trust your judgement in administering the rule to your own job
@MLE_online "I'm good with the customers!" -- hat tip to "Office Space" πŸ˜†
@MLE_online I could say I help companies keep from blowing their employees up. (or dropping them off a roof, electrocuting them etc.) I'm still a jerk with a clipboard but i think we're making a difference..

@MLE_online Single sentence: "I create instructional guides which includes writing code, writing copy, taking photos, filming videos, composing music, and doing illustrations and I also manage digital fabrication with laser cutters and 3D printers and I also manage live-streaming and do design for 2D and 3D and product development and also tech support, customer support, and occasional event support as staff for tradeshow booths."

(I work at a small company and we all do a lot.)